I'm not quite sure what you mean. "Enable web games"? You mean in the browsing section, or...?
EDIT: OK, you mean when you browse web games, they all say "Play In Browser". I dunno, I mean, the web game and the full game are different projects, I guess? Maybe there's a way to unlist the web demo of the game from the web section, and have a link to it in the full game page?